Conspiracy theorists have claimed Hillary Clinton used a body double after she suffered a dizzy spell at the 9/11 memorial on Sunday.
Social media users have begun sharing photo comparisons of the Democratic candidate to point out supposed 'physical differences' in the Clinton that was seen emerging from her daughter Chelsea Clinton's house after the medical episode.
Video of Clinton collapsing as she climbed into a van after visiting the National September 11 Memorial &Museum in New York City sparked health concerns.
The 68-year-old, who later announced she is suffering from pneumonia, insisted she did not faint but simply felt dizzy and stumbled.
She said after sitting in the air conditioning and drinking a glass of water she 'immediately' began feeling better and felt well enough to take a detour to visit her daughter Chelsea and her grandchildren.
However, critics say the woman who emerged from Chelsea’s apartment was a lookalike and not the real deal.
‘Hillary's INDEX finger is longer than her RING finger. This ISNT Hillary [sic],’ a Twitter user called Always Trump wrote.
One woman said: ‘Body double before &after #ClintonCollapse? Just a theory, but nose looks very different.’
Conspiracy theorists have claimed Clinton's nose normally points upwards (right) but was pointing down on Sunday (left)
Others analysed Clinton’s ears and claimed the woman who emerged from Chelsea's apartment had chunkier lobes.
Some compared pictures of the presidential hopeful that appear to show she had lost weight compared to earlier in the campaign. It is likely that someone suffering from pneumonia would appear frailer than usual.
Twitter user Robertbirsinger questioned why Clinton would hug a child in the street when she’s got such an illness and others claimed it was suspicious that she wasn’t surrounded by security when she emerged from Chelsea’s apartment.
The hashtag #isHillaryalive also began circulating after the comparison photos emerged.
Clinton's campaign has desperately attempted to stem any concerns around her health.
Bill Clinton announced he was taking over for his wife at several upcoming events as she recovers, and will now headline the Hillary Victory Fund events in California on Tuesday. He will also campaign in Nevada on Hillary's behalf on Wednesday.
He told CBS News' Charlie Rose on Monday that his wife had suffered the same symptoms in the past when she's become exhausted.
Asked if it's possible Clinton will be away for weeks from the campaign trail, the former President said: 'No, not a shot.'